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Diffstat (limited to 'src/demod/python/cqpsk.py')
| -rw-r--r-- | src/demod/python/cqpsk.py | 370 |
1 files changed, 0 insertions, 370 deletions
diff --git a/src/demod/python/cqpsk.py b/src/demod/python/cqpsk.py deleted file mode 100644 index f9621b1..0000000 --- a/src/demod/python/cqpsk.py +++ /dev/null @@ -1,370 +0,0 @@ -# -# Copyright 2005,2006,2007 Free Software Foundation, Inc. -# -# cqpsk.py (C) Copyright 2009, KA1RBI -# -# This file is part of GNU Radio -# -# GNU Radio is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 3, or (at your option) -# any later version. -# -# GNU Radio is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -# GNU General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with GNU Radio; see the file COPYING. If not, write to -# the Free Software Foundation, Inc., 51 Franklin Street, -# Boston, MA 02110-1301, USA. -# - -# See gnuradio-examples/python/digital for examples - -""" -differential PI/4 CQPSK modulation and demodulation. -""" - -from gnuradio import gr, gru -from math import pi, sqrt -#import psk -import cmath -from pprint import pprint - -_def_has_gr_digital = False - -# address gnuradio 3.5.x changes -try: - from gnuradio import modulation_utils -except ImportError: - from gnuradio import digital - _def_has_gr_digital = True - -# default values (used in __init__ and add_options) -_def_samples_per_symbol = 10 -_def_excess_bw = 0.35 -_def_gray_code = True -_def_verbose = False -_def_log = False - -_def_costas_alpha = 0.15 -_def_gain_mu = None -_def_mu = 0.5 -_def_omega_relative_limit = 0.005 - - -# ///////////////////////////////////////////////////////////////////////////// -# CQPSK modulator -# ///////////////////////////////////////////////////////////////////////////// - -class cqpsk_mod(gr.hier_block2): - - def __init__(self, - samples_per_symbol=_def_samples_per_symbol, - excess_bw=_def_excess_bw, - verbose=_def_verbose, - log=_def_log): - """ - Hierarchical block for RRC-filtered QPSK modulation. - - The input is a byte stream (unsigned char) and the - output is the complex modulated signal at baseband. - - @param samples_per_symbol: samples per symbol >= 2 - @type samples_per_symbol: integer - @param excess_bw: Root-raised cosine filter excess bandwidth - @type excess_bw: float - @param verbose: Print information about modulator? - @type verbose: bool - @param debug: Print modualtion data to files? - @type debug: bool - """ - - gr.hier_block2.__init__(self, "cqpsk_mod", - gr.io_signature(1, 1, gr.sizeof_char), # Input signature - gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature - - self._samples_per_symbol = samples_per_symbol - self._excess_bw = excess_bw - - if not isinstance(samples_per_symbol, int) or samples_per_symbol < 2: - raise TypeError, ("sbp must be an integer >= 2, is %d" % samples_per_symbol) - - ntaps = 11 * samples_per_symbol - - arity = 8 - - # turn bytes into k-bit vectors - self.bytes2chunks = \ - gr.packed_to_unpacked_bb(self.bits_per_symbol(), gr.GR_MSB_FIRST) - - # 0 +45 1 [+1] - # 1 +135 3 [+3] - # 2 -45 7 [-1] - # 3 -135 5 [-3] - self.pi4map = [1, 3, 7, 5] - self.symbol_mapper = gr.map_bb(self.pi4map) - self.diffenc = gr.diff_encoder_bb(arity) - self.chunks2symbols = gr.chunks_to_symbols_bc(psk.constellation[arity]) - - # pulse shaping filter - self.rrc_taps = gr.firdes.root_raised_cosine( - self._samples_per_symbol, # gain (sps since we're interpolating by sps) - self._samples_per_symbol, # sampling rate - 1.0, # symbol rate - self._excess_bw, # excess bandwidth (roll-off factor) - ntaps) - - self.rrc_filter = gr.interp_fir_filter_ccf(self._samples_per_symbol, self.rrc_taps) - - if verbose: - self._print_verbage() - - if log: - self._setup_logging() - - # Connect & Initialize base class - self.connect(self, self.bytes2chunks, self.symbol_mapper, self.diffenc, - self.chunks2symbols, self.rrc_filter, self) - - def samples_per_symbol(self): - return self._samples_per_symbol - - def bits_per_symbol(self=None): # staticmethod that's also callable on an instance - return 2 - bits_per_symbol = staticmethod(bits_per_symbol) # make it a static method. RTFM - - def _print_verbage(self): - print "\nModulator:" - print "bits per symbol: %d" % self.bits_per_symbol() - print "Gray code: %s" % self._gray_code - print "RRS roll-off factor: %f" % self._excess_bw - - def _setup_logging(self): - print "Modulation logging turned on." - self.connect(self.bytes2chunks, - gr.file_sink(gr.sizeof_char, "tx_bytes2chunks.dat")) - self.connect(self.symbol_mapper, - gr.file_sink(gr.sizeof_char, "tx_graycoder.dat")) - self.connect(self.diffenc, - gr.file_sink(gr.sizeof_char, "tx_diffenc.dat")) - self.connect(self.chunks2symbols, - gr.file_sink(gr.sizeof_gr_complex, "tx_chunks2symbols.dat")) - self.connect(self.rrc_filter, - gr.file_sink(gr.sizeof_gr_complex, "tx_rrc_filter.dat")) - - def add_options(parser): - """ - Adds QPSK modulation-specific options to the standard parser - """ - parser.add_option("", "--excess-bw", type="float", default=_def_excess_bw, - help="set RRC excess bandwith factor [default=%default] (PSK)") - parser.add_option("", "--no-gray-code", dest="gray_code", - action="store_false", default=_def_gray_code, - help="disable gray coding on modulated bits (PSK)") - add_options=staticmethod(add_options) - - - def extract_kwargs_from_options(options): - """ - Given command line options, create dictionary suitable for passing to __init__ - """ - return modulation_utils.extract_kwargs_from_options(dqpsk_mod.__init__, - ('self',), options) - extract_kwargs_from_options=staticmethod(extract_kwargs_from_options) - - -# ///////////////////////////////////////////////////////////////////////////// -# CQPSK demodulator -# -# ///////////////////////////////////////////////////////////////////////////// - -class cqpsk_demod(gr.hier_block2): - - def __init__(self, - samples_per_symbol=_def_samples_per_symbol, - excess_bw=_def_excess_bw, - costas_alpha=_def_costas_alpha, - gain_mu=_def_gain_mu, - mu=_def_mu, - omega_relative_limit=_def_omega_relative_limit, - gray_code=_def_gray_code, - verbose=_def_verbose, - log=_def_log): - """ - Hierarchical block for RRC-filtered CQPSK demodulation - - The input is the complex modulated signal at baseband. - The output is a stream of floats in [ -3 / -1 / +1 / +3 ] - - @param samples_per_symbol: samples per symbol >= 2 - @type samples_per_symbol: float - @param excess_bw: Root-raised cosine filter excess bandwidth - @type excess_bw: float - @param costas_alpha: loop filter gain - @type costas_alphas: float - @param gain_mu: for M&M block - @type gain_mu: float - @param mu: for M&M block - @type mu: float - @param omega_relative_limit: for M&M block - @type omega_relative_limit: float - @param gray_code: Tell modulator to Gray code the bits - @type gray_code: bool - @param verbose: Print information about modulator? - @type verbose: bool - @param debug: Print modualtion data to files? - @type debug: bool - """ - - gr.hier_block2.__init__(self, "cqpsk_demod", - gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature - gr.io_signature(1, 1, gr.sizeof_float)) # Output signature - - self._samples_per_symbol = samples_per_symbol - self._excess_bw = excess_bw - self._costas_alpha = costas_alpha - self._mm_gain_mu = gain_mu - self._mm_mu = mu - self._mm_omega_relative_limit = omega_relative_limit - self._gray_code = gray_code - - if samples_per_symbol < 2: - raise TypeError, "sbp must be >= 2, is %d" % samples_per_symbol - - arity = pow(2,self.bits_per_symbol()) - - # Automatic gain control - scale = (1.0/16384.0) - self.pre_scaler = gr.multiply_const_cc(scale) # scale the signal from full-range to +-1 - #self.agc = gr.agc2_cc(0.6e-1, 1e-3, 1, 1, 100) - self.agc = gr.feedforward_agc_cc(16, 2.0) - - # RRC data filter - ntaps = 11 * samples_per_symbol - self.rrc_taps = gr.firdes.root_raised_cosine( - 1.0, # gain - self._samples_per_symbol, # sampling rate - 1.0, # symbol rate - self._excess_bw, # excess bandwidth (roll-off factor) - ntaps) - self.rrc_filter=gr.interp_fir_filter_ccf(1, self.rrc_taps) - - if not self._mm_gain_mu: - sbs_to_mm = {2: 0.050, 3: 0.075, 4: 0.11, 5: 0.125, 6: 0.15, 7: 0.15} - self._mm_gain_mu = sbs_to_mm[samples_per_symbol] - - self._mm_omega = self._samples_per_symbol - self._mm_gain_omega = .25 * self._mm_gain_mu * self._mm_gain_mu - self._costas_beta = 0.25 * self._costas_alpha * self._costas_alpha - fmin = -0.025 - fmax = 0.025 - - if not _def_has_gr_digital: - self.receiver=gr.mpsk_receiver_cc(arity, pi/4.0, - self._costas_alpha, self._costas_beta, - fmin, fmax, - self._mm_mu, self._mm_gain_mu, - self._mm_omega, self._mm_gain_omega, - self._mm_omega_relative_limit) - else: - self.receiver=digital.mpsk_receiver_cc(arity, pi/4.0, - 2*pi/150, - fmin, fmax, - self._mm_mu, self._mm_gain_mu, - self._mm_omega, self._mm_gain_omega, - self._mm_omega_relative_limit) - - self.receiver.set_alpha(self._costas_alpha) - self.receiver.set_beta(self._costas_beta) - - # Perform Differential decoding on the constellation - self.diffdec = gr.diff_phasor_cc() - - # take angle of the difference (in radians) - self.to_float = gr.complex_to_arg() - - # convert from radians such that signal is in -3/-1/+1/+3 - self.rescale = gr.multiply_const_ff( 1 / (pi / 4) ) - - if verbose: - self._print_verbage() - - if log: - self._setup_logging() - - # Connect & Initialize base class - self.connect(self, self.pre_scaler, self.agc, self.rrc_filter, self.receiver, - self.diffdec, self.to_float, self.rescale, self) - - def samples_per_symbol(self): - return self._samples_per_symbol - - def bits_per_symbol(self=None): # staticmethod that's also callable on an instance - return 2 - bits_per_symbol = staticmethod(bits_per_symbol) # make it a static method. RTFM - - def _print_verbage(self): - print "\nDemodulator:" - print "bits per symbol: %d" % self.bits_per_symbol() - print "Gray code: %s" % self._gray_code - print "RRC roll-off factor: %.2f" % self._excess_bw - print "Costas Loop alpha: %.2e" % self._costas_alpha - print "Costas Loop beta: %.2e" % self._costas_beta - print "M&M mu: %.2f" % self._mm_mu - print "M&M mu gain: %.2e" % self._mm_gain_mu - print "M&M omega: %.2f" % self._mm_omega - print "M&M omega gain: %.2e" % self._mm_gain_omega - print "M&M omega limit: %.2f" % self._mm_omega_relative_limit - - def _setup_logging(self): - print "Modulation logging turned on." - self.connect(self.pre_scaler, - gr.file_sink(gr.sizeof_gr_complex, "rx_prescaler.dat")) - self.connect(self.agc, - gr.file_sink(gr.sizeof_gr_complex, "rx_agc.dat")) - self.connect(self.rrc_filter, - gr.file_sink(gr.sizeof_gr_complex, "rx_rrc_filter.dat")) - self.connect(self.receiver, - gr.file_sink(gr.sizeof_gr_complex, "rx_receiver.dat")) - self.connect(self.diffdec, - gr.file_sink(gr.sizeof_gr_complex, "rx_diffdec.dat")) - self.connect(self.to_float, - gr.file_sink(gr.sizeof_float, "rx_to_float.dat")) - self.connect(self.rescale, - gr.file_sink(gr.sizeof_float, "rx_rescale.dat")) - - def add_options(parser): - """ - Adds modulation-specific options to the standard parser - """ - parser.add_option("", "--excess-bw", type="float", default=_def_excess_bw, - help="set RRC excess bandwith factor [default=%default] (PSK)") - parser.add_option("", "--no-gray-code", dest="gray_code", - action="store_false", default=_def_gray_code, - help="disable gray coding on modulated bits (PSK)") - parser.add_option("", "--costas-alpha", type="float", default=_def_costas_alpha, - help="set Costas loop alpha value [default=%default] (PSK)") - parser.add_option("", "--gain-mu", type="float", default=_def_gain_mu, - help="set M&M symbol sync loop gain mu value [default=%default] (PSK)") - parser.add_option("", "--mu", type="float", default=_def_mu, - help="set M&M symbol sync loop mu value [default=%default] (PSK)") - add_options=staticmethod(add_options) - - def extract_kwargs_from_options(options): - """ - Given command line options, create dictionary suitable for passing to __init__ - """ - return modulation_utils.extract_kwargs_from_options( - cqpsk_demod.__init__, ('self',), options) - extract_kwargs_from_options=staticmethod(extract_kwargs_from_options) - - -# -# Add these to the mod/demod registry -# -#modulation_utils.add_type_1_mod('cqpsk', cqpsk_mod) -#modulation_utils.add_type_1_demod('cqpsk', cqpsk_demod) - |